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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Listing the first 5 observations |

Date |
Wed, 29 Aug 2012 15:31:43 +0100 |

-if- and -in- are completely unrelated. Usually this is a feature, but here it means that you have to do some work to get what you want. One way is gen OK = age == 49 sort OK l var1 in -5/L Another way is browse var1 if age == 49 where in practice you will get a screenful. I've not been serious about your stipulation of randomness; I guess you mean no more than arbitrary. Note: one criterion; two or more criteria. Nick On Wed, Aug 29, 2012 at 3:23 PM, Damian Finlayson <damian.finlayson@gmail.com> wrote: > This seems like a relatively simple query but no matter which way I > try I cannot get it to work. > > I am trying to randomly select a number of observations according a > set criteria. > > Say I have 3 variables: var1, var2 and random. Var1 consists purely > of unique values (such as names). Var 2 has groups/categories (e.g. > age). Random consists of unique random numbers. > > I would like to get stata to sort each category (age) by a random > number and then list the first 5 names for a given age say 49. > > The command I am trying to use is: > > list var1 if age == 49 > > but I cannot seem to amend this command so that only the first 5 > observations (as per the random number) are listed. If I use in 1/5 > it does not work as the first observation for age 49 could be the 53 > observation the second at 114 and so on. If I ask for all > observations I could end up with thousands of names being listed. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Listing the first 5 observations***From:*Damian Finlayson <damian.finlayson@gmail.com>

**References**:**st: Listing the first 5 observations***From:*Damian Finlayson <damian.finlayson@gmail.com>

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